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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962508721ac6c8922ba03dbd8510bff1c9edcda6f9106783e349c0c14a3fd8bc' 
  AND token = 'OE9v1KzM50LbOjp2/qngh/nhzkil0q2z+qMbUBzOLB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}